Bottom line: this is doable. Rental income covers the developer’s costs and profit and the ongoing building management and rental subsidy cost per resident is just $1103 a month. A few years ago, the average cost of supportive housing in San Francisco was $17,353 a year per person. Given Bay Area inflation rates, let’s say it’s $24,000 now, or $2000 a month. The above scheme is a lot cheaper. Now if only local politics would align with my vision.